Final answer:
The person described appears to be exhibiting symptoms of severe anxiety, neuroticism, and possible brain malfunctioning or mental disorder, as evidenced by their disturbed behavior, auditory hallucinations, and extreme sensitivity to stimuli.
Step-by-step explanation:
The symptoms exhibited by the person described in the passage include intense anxiety and irritability, as shown by their hurried and unequal pace when roaming from room to room and the neglect of ordinary activities. Additionally, they show signs of a possible brain malfunction or mental disorder, indicated by their trembling voice and terror, and their fixation on imaginary sounds. These symptoms align with neuroticism, which involves experiencing negative emotions such as anxiety, anger, and hostility, and can be a risk factor for chronic health problems. People with high levels of neuroticism, like the individual described, tend to feel emotional instability and display socially unacceptable and unhealthy behaviors.
The individual might also be suffering from delusions and hallucinations, as implied by their gazing upon vacancy and listening to imaginary sounds, thus showing a tendency to act in a socially unacceptable and unhealthy manner. This could be an implication of schizophrenia, a severe mental disorder characterized by distortions in thinking, perception, emotions, language, sense of self, and behavior.